Unfortunately it appears that today's 9x9 difficult has morethan one solution

Just so people don't get stuck on the "wrong" solution:the one that's stored in the database has an 8 on c1,a 6 on f1, and a 2 on i8.

I'll try to fix this ASAP..

Patrick

I struggled with this one earlier today before giving up for a while to do something else. On reading this thread, I put the values stated above into my grid (I already had the 2 and knew f1 was either 6 or 8) and quickly finished it... but I got the ERROR message, saying my solution was incorrect. Comparing my solution to fzpowerman47's, I see we got the same solution.

Part of the reason I struggled earlier is that I saw that the pairs at a5-b5 and a9-b9 appeared to be 6 and 8, signaling a non-unique solution. So I tried to find a different way around it without success. The values at c1, f1, and i8 don't help to resolve the deadlock at a-b5 and ab-9.

Glad to know I wasn't delusional when I thought there was something wrong with this one!

Part of the reason I struggled earlier is that I saw that the pairs at a5-b5 and a9-b9 appeared to be 6 and 8, signaling a non-unique solution. So I tried to find a different way around it without success. The values at c1, f1, and i8 don't help to resolve the deadlock at a-b5 and ab-9.

I just gave a few values in the "cycles" that I saw.

The last two rows:495317862867249531

In any case, I sent the database solution to anyone who submitted a solution(I get a warning message here when a supposedly incorrect solution issubmitted for a puzzle).

Now I've got about an hour to fix the problem, or I'll probably have toremove tomorrow's Killer Sudokus just in case.. :(